Make the `-L' (trace-level) option's argument optional, like the long
-rw-r--r-- 52 .cvsignore
-rw-r--r-- 94 .links
-rw-r--r-- 1446 Makefile.am
-rw-r--r-- 2990 acconfig.h
drwxr-xr-x - conf
-rw-r--r-- 4045 configure.in
drwxr-xr-x - manual
drwxr-xr-x - src
-rw-r--r-- 10 stamp-h.in